I believe that my arguments justify this bolder conclusion. I began with a strategic metaphor. The Self-interest Theory has two rivals: morality, and the Present-aim Theory. In some respects it lies between these two rivals. It is therefore vulnerable in what is often a fatal way: it can be attacked from two directions. The Self-interest Theory has long been dominant in our intellectual tradition. But this dominance has largely derived from the failure of its two rivals to attack together. When it is attacked by moral theorists, it has stolen strength from the Present-aim Theory, and vice
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Good explanation of what is wrong in his theory.
